Hi Bill
The price difference depends on where you live. Hasegawa kits are actually often as cheap, or cheaper, than Revell in the Far East (don't we all love distributors!

). The nice thing in the UK is that Revell's Fw 190 is already easily found at less than £30.00, which definitely makes it more attractive than at the MRP.
Make no mistake, I'll probably get one (at full price), as my LHS will likely get a couple in and I always try to support them where I can.
All the best
Rowan